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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.common.value.qual;

import org.checkerframework.framework.qual.SubtypeOf;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * An annotation indicating the possible values for a String type. The annotation's arguments are
 * Java regular expressions. If an expression's type has this annotation, then at run time, the
 * expression evaluates to a string that matches at least one of the regular expressions. Matching
 * is via the java.lang.String#matches
 * method, which matches against the entire string (it does not look for a match against a
 * substring).
 *
 * @checker_framework.manual #constant-value-checker Constant Value Checker
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_PARAMETER, ElementType.TYPE_USE})
@SubtypeOf({UnknownVal.class})
public @interface MatchesRegex {
    /**
     * A set of Java regular expressions.
     *
     * @return the regular expressions
     */
    String[] value();
}